Field Guide
Disclosure Timeline
From Kenneth Arnold to the Pentagon file drops — the phenomenon as a chronology.
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Kenneth Arnold sighting
Pilot Kenneth Arnold reports nine fast-moving objects near Mount Rainier, Washington; the press coverage that follows coins the term 'flying saucer'.
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Roswell incident
The Roswell Army Air Field announces, then retracts within hours, the recovery of a 'flying disc' near Roswell, New Mexico, recharacterizing it as a weather balloon.
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Mantell incident
Kentucky Air National Guard pilot Thomas Mantell dies when his P-51 crashes during a pursuit of a UFO later attributed to a high-altitude Skyhook balloon.
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Project Blue Book begins
The U.S. Air Force formally launches Project Blue Book, the longest-running of its official studies of unidentified flying objects.
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Washington, D.C. flap
Radar operators and pilots track unexplained objects over Washington, D.C. across two July weekends, prompting a widely covered Air Force press conference.
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Hill abduction account
Betty and Barney Hill report a missing-time encounter in rural New Hampshire, a case that became the template for later abduction narratives.
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Congressional UFO hearing
The House Armed Services Committee holds a brief hearing on UFOs, prompting the Air Force to commission an independent university study.
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Condon Report released
The University of Colorado's Condon Report concludes further UFO study is unlikely to yield scientific value; the Air Force cites it when closing Project Blue Book later that year.
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Project Blue Book ends
The U.S. Air Force formally terminates Project Blue Book after investigating 12,618 reported sightings over 17 years.
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Vallee's 'The Invisible College'
Computer scientist Jacques Vallee advances the view that the phenomenon behaves more like a control system or folklore than a straightforward extraterrestrial visitation.
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NUFORC founded
Robert Gribble establishes the National UFO Reporting Center (NUFORC) in Seattle as a public hotline and database for sighting reports.
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Rendlesham Forest incident
Over several nights, U.S. Air Force personnel at RAF Woodbridge in England report strange lights and an object in Rendlesham Forest, later documented in the 'Halt memo'.
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Phoenix Lights
Thousands of witnesses across Arizona report a large V-shaped formation of lights; the Air Force later attributes some sightings to flares dropped during a military exercise.
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Nimitz 'Tic Tac' encounter
Navy pilots from the USS Nimitz carrier group, including Cmdr. David Fravor, report an unidentified object off the California coast that became known as the 'Tic Tac'.
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AATIP-era funding begins
The Defense Intelligence Agency funds the Advanced Aerospace Threat Identification Program (AATIP) era, a study of unexplained aerial phenomena active until roughly 2012.
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Gimbal and GoFast encounters
Navy aircrews off the U.S. East Coast record the infrared footage later released publicly as the 'Gimbal' and 'GoFast' videos.
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New York Times reveals AATIP
The New York Times reports on AATIP and publishes Navy UFO footage; former program official Luis Elizondo, who had resigned weeks earlier, goes public, joined by ex-Pentagon official Christopher Mellon.
AATIP — Advanced Aerospace Threat Identification Program · Luis "Lue" Elizondo · Christopher Mellon
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Pentagon authenticates Navy videos
The Department of Defense officially releases and authenticates the three Navy videos ('FLIR', 'Gimbal', 'GoFast'), confirming the footage is genuine and the objects remain unidentified.
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ODNI preliminary UAP assessment
The Office of the Director of National Intelligence delivers a preliminary assessment to Congress reviewing 144 UAP reports, finding most could not be explained with available data.
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First open UAP hearing since 1966
A House Intelligence subcommittee holds the first open congressional hearing on UAP in over half a century, with senior Pentagon officials testifying.
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AARO established
The Deputy Secretary of Defense directs the creation of the All-domain Anomaly Resolution Office (AARO); Sean Kirkpatrick is later named its first director.
AARO — All-domain Anomaly Resolution Office · Sean Kirkpatrick
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UAP Disclosure Act introduced
Senators Chuck Schumer and Mike Rounds introduce the UAP Disclosure Act as an amendment to the defense authorization bill, proposing a review board for government records.
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House Oversight UAP hearing
Former intelligence officer David Grusch testifies alongside Navy veterans David Fravor and Ryan Graves at a House Oversight subcommittee hearing on UAP.
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AARO historical record report
AARO releases Volume I of its historical record report, finding no verifiable evidence that the U.S. government has recovered extraterrestrial technology.
AARO — All-domain Anomaly Resolution Office · The UAP Disclosure Act
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Pentagon 'Release 02' file drop
In this site's storyline, the Pentagon publishes a second tranche of declassified UAP records, dubbed 'Release 02', expanding on earlier disclosures.
AARO — All-domain Anomaly Resolution Office · Sean Kirkpatrick
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Lake Huron shootdown
In this site's storyline, an unidentified object is downed over Lake Huron, prompting an AARO-led recovery and assessment.
The Lake Huron Shootdown · AARO — All-domain Anomaly Resolution Office · Sean Kirkpatrick